/r/OutOfTheLoop - Have you ever seen a whole bunch of news stories/reddit posts/videos or anything else about some topic and you had no idea what everyone was going on about? Here is where can ask what it is all about!

/r/Serendipity - a meta-subreddit meant to broaden the perspective of its subscribers. It takes a popular entry from a random subreddit and posts it every few hours.
If you want to increase your exposure to niche subreddits, or just your perspective on things on the web in general, serendipity might help you do that. But it might not. It's a bot, after all.

/r/TellReddit - Feel like telling everyone something but don't want to do an AMA? Then this is the subreddit for you!

One day at a time. I also have depression and am on meds. I know what you mean by it still hanging around. It sucks. Surround yourself with people and things that make you feel good. Don't let it define you.

It's hard living with a mental illness, some days it's a struggle to even take care of yourself, others it's not so bad.

Talking to a therapist is a great plan! Therapy has helped me so much, also check out r/depression like buildingbridges suggested. Sometimes a large community with common ground is incredibly helpful.

Do you exercise regularly? I've found exercise helps me a lot with depression. After each workout I'd feel less depressed and after about two weeks into the routine I started feeling less depressed in general and more confident about myself.